Access code and Back door

Access code noun - A code (a series of characters or digits) that must be entered in some way (typed or dialed or spoken) to get the use of something (a telephone line or a computer or a local area network etc.).

Back door and access code are semantically related. In some cases you can replace phrase "Back door" with "Access code", this phrases are similar.

Back door noun - An undocumented way to get access to a computer system or the data it contains.

Access code and back door are semantically related. Sometimes you can use "Access code" instead a noun phrase "Back door".